EP0095389A2 - Datenübertragungssystem - Google Patents

Datenübertragungssystem Download PDF

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Publication number
EP0095389A2
EP0095389A2 EP83303030A EP83303030A EP0095389A2 EP 0095389 A2 EP0095389 A2 EP 0095389A2 EP 83303030 A EP83303030 A EP 83303030A EP 83303030 A EP83303030 A EP 83303030A EP 0095389 A2 EP0095389 A2 EP 0095389A2
Authority
EP
European Patent Office
Prior art keywords
data
level
time
transmission system
data transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP83303030A
Other languages
English (en)
French (fr)
Other versions
EP0095389A3 (en
EP0095389B1 (de
Inventor
Masahiro Ise
Hidehiko Tanaka
Katsuyuki Machino
Toshiyuki Matsubara
Teiji Terasaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Publication of EP0095389A2 publication Critical patent/EP0095389A2/de
Publication of EP0095389A3 publication Critical patent/EP0095389A3/en
Application granted granted Critical
Publication of EP0095389B1 publication Critical patent/EP0095389B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks

Definitions

  • This invention relates a data transmission system wherein a plurality of transmission modules are connected in a multidrop manner.
  • Fig. 1 A typical example of a multidrop connection scheme is illustrated in Fig. 1, which includes a power distribution cable 1 and a plurality of transmission modules 2 for transmission and receipt of data.
  • Fig. 1 A typical example of a multidrop connection scheme is illustrated in Fig. 1, which includes a power distribution cable 1 and a plurality of transmission modules 2 for transmission and receipt of data.
  • the most serious problem of this kind of system is that in the event that any one of the transmission modules 2 is faulty in a hardware aspect but signals representative of transmission data are supplied continuously to the cable 1 the system becomes disabled as a whole and falls to send signals. In the case that a large number of the modules are installed, it is very difficult which module is wrong.
  • a data transmission system including a plurality of transmission modules connected to a single cable in a multidrop manner, each of said transmission modules comprising means for generating codes which do not last at the same level for more than a given time even when the same data are transmitted continuously, means for monitoring the time where said codes last at the same level, and means for considering the subject module as faulty and compelling the transmission state to a halt If said last time as monitored by said monitoring means exceeds a predetermined time.
  • the present invention therefore provides a very useful data transmission system having the plurality of transmission modules connected to the single cable in a multidrop manner, which system treats a specific module with proper signals lasting at the same level for more than a given time except cable outputs, as involving a faulty condition and compels the transmission state to a halt, thus preventing only such a faulty module or modules from transmitting signals and avoiding breakdown of the whole system.
  • FIGs. 2 to 11 there are illustrated a few embodiments of the present invention.
  • the simplest data format is a so-called NRZ (Non Return to Zero) in which the signel level corresponds to the data on a one-to-one basis.
  • NRZ Non Return to Zero
  • a voltage corresponding to a data is applied to a signal line every a predetermined time ⁇ as seen in Fig. 2.
  • a data "1" is defined by a voltage V and a data "0" by a voltage V M .
  • V M a voltage
  • the level remains constant and unchanged. This fact results in great difficulties in seeing if correct data are transmitted or any hardware trouble comes up in the system.
  • the above problem may be overcome, provided that data are not represented by voltage levels on the one-to-one basis but by voltage variations.
  • each bit time ⁇ is divided into two half slots and a data "0" is defined by a combination of levels “1” and “0” in time sequence and a data "1” by a combination of levels "0" and “1” In time sequence (or vice versa).
  • a data "0" is defined by a combination of levels “1” and “0” in time sequence
  • a data "1” by a combination of levels "0” and “1” In time sequence (or vice versa).
  • no event there is any signal lasting at the same level for more than ⁇ seconds for possible four combinations of data as would be understood from Fig. 4.
  • any signal lasts at the same level for more than ⁇ seconds
  • a reference time is selected to be longer than ⁇ and preferably selected to be more than 2 r. If there is no variation in the level of the signal being transmitted for more than such reference time, then the remedy taken thereafter is to treat the subject transmission module as having a hardware problem, disconnect its level supplying section and indicate that the subject module is out of condition.
  • a cable 1 for module-to-module signal transmission (also for power distribution), a disconnecting switch 21 for disconnecting the faulty transmission module or modules from the transmission cable during a silence interval or forced interruption of transmission and an AND gate 24 for controlling the switch 21.
  • a transmission output section is denoted by 22 and whether the output section 22 is in the transmission state is determined by a signal TXSENSE.
  • a transmission level setting section 23 outputs levels corresponding to outputs from the preceding code converter 25.
  • the code converter 25 is adapted to convert NRZ data into a suitable code notation (the Manchester code or the like as described above).
  • a data geneation and control section 26 on one hand feeds the NRZ data to the code converter 25 and on the other hand feeds a transmission/disconnection signal TXENABLE to the AND gate 24.
  • Another AND gate 27 Is to permit monitoring of the transmission level by the signal TXSENSE only while the switch 21 is ON.
  • a timer 28 is adapted for measuring the time where the signal lasts at the same level and especially is cleared every variation in the level and keeps timer operation while the transmission level remains unchanged.
  • the signal TXSENSE is derived from an OR gate 34 responsive to the outputs of the two detector circuits 32 and 33.
  • the detection levels may be optionally selected through the use of R S1 and R S2 with the resistances determined by the following definition.
  • FIG. 9 Various signals occurring in the circuit of Fig. 8 in operation are depicted in Fig. 9.
  • the output of the circuit 32 is A and the output of the circuit 33 is B.
  • Charging of a capacitor C via a resistor R starts when a transistor Tr 3 or Tr 4 in the detector circuits is turned ON and the output appears with a time delay T determined as a function of the CR time constant and the threshold voltage Vth of the OR gate 34 as follows:
  • the timer 28 of Fig. 7 is made up by a CR integration circuit. Whenever the level of the signal under transmission changes, the signal TXSENSE never fail to fall to zero for the time T. This results in Initializing the timer to zero and re-starting time measurement. As already described, If the signal TXSENSE lasts for more than the reference time, the signal TIMEOUT is developed to force the transmission state to a halt.
  • FIG. 10 Another embodiment of the present invention using AM modulation is shown In Fig. 10, with simpler circuit than the previous embodiment of Fig. 7.
  • the components 1, 22, 24 - 26 are similar to those in Fig. 7.
  • a transmission/disconnection switch 21' also serves to determine whether to apply the carrier.
  • a carrier oscillator is denoted by 41.
  • Fig. 11 shows a circuit corresponding to that in Fig. 8, wherein a CR integration circuit 42 is equivalent to the timer 28 of Fig. 7.
  • the CR time constant of the integration circuit 42 Is selected within a range from T to 2T.
  • the circuit 33 in Fig. 8 is not necessary because of the need for only decision as to whether to apply the carrier.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Dc Digital Transmission (AREA)
  • Small-Scale Networks (AREA)
EP83303030A 1982-05-25 1983-05-25 Datenübertragungssystem Expired EP0095389B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP57089251A JPS58205353A (ja) 1982-05-25 1982-05-25 デ−タ伝送システム
JP89251/82 1982-05-25

Publications (3)

Publication Number Publication Date
EP0095389A2 true EP0095389A2 (de) 1983-11-30
EP0095389A3 EP0095389A3 (en) 1985-05-15
EP0095389B1 EP0095389B1 (de) 1988-05-11

Family

ID=13965535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83303030A Expired EP0095389B1 (de) 1982-05-25 1983-05-25 Datenübertragungssystem

Country Status (5)

Country Link
US (1) US4888586A (de)
EP (1) EP0095389B1 (de)
JP (1) JPS58205353A (de)
CA (1) CA1194954A (de)
DE (1) DE3376611D1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5142530A (en) * 1989-10-16 1992-08-25 International Business Machines Corporation Multi-frame stripping protocol for token ring networks
EP0483935A3 (en) * 1990-11-01 1992-10-14 Siemens Aktiengesellschaft Active star network for an optical transmission system
EP0538473A4 (en) * 1990-12-04 1995-01-25 Furukawa Electric Co Ltd Voltage setting apparatus in multiplex transmission system
FR2769780A1 (fr) * 1997-10-10 1999-04-16 Peugeot Systeme de transmission d'informations entre stations raccordees par un reseau multiplexe, notamment pour vehicule automobile

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5266943A (en) * 1982-05-25 1993-11-30 Sharp Kabushiki Kaisha Data transmission system
JP2639373B2 (ja) * 1995-01-17 1997-08-13 株式会社ニコン カメラシステム、カメラ及びそのアクセサリー
US6865181B1 (en) 1999-03-22 2005-03-08 Cisco Technology, Inc. Method and apparatus for routing telecommunications signals
US7924706B1 (en) 1999-03-22 2011-04-12 Cisco Technology, Inc. Method and apparatus for controlling the operation of a flexible cross-connect system
US7035204B1 (en) 2000-07-26 2006-04-25 Cicso Technology, Inc. Method and apparatus for rerouting telecommunications signals
US7929448B2 (en) * 2006-10-17 2011-04-19 Verizon Patent And Licensing Inc. Monitoring link aggregation links
US7835291B2 (en) * 2006-10-17 2010-11-16 Verizon Patent And Licensing Inc. Disabled state and state signaling for link aggregation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5432283B2 (de) * 1973-08-27 1979-10-13
US4063220A (en) * 1975-03-31 1977-12-13 Xerox Corporation Multipoint data communication system with collision detection
JPS55117362A (en) * 1979-03-02 1980-09-09 Nec Corp Input break detection circuit for cmi code
JPS5811784B2 (ja) * 1979-10-03 1983-03-04 株式会社日立製作所 デイジタル信号伝送装置の異常検出方式
GB2094110A (en) * 1981-01-30 1982-09-08 Eltra Corp A method and apparatus for locating a discontinuity in a data transmission
US4561091A (en) * 1983-09-23 1985-12-24 Codenoll Technology Corporation Data receiver

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5142530A (en) * 1989-10-16 1992-08-25 International Business Machines Corporation Multi-frame stripping protocol for token ring networks
EP0483935A3 (en) * 1990-11-01 1992-10-14 Siemens Aktiengesellschaft Active star network for an optical transmission system
EP0538473A4 (en) * 1990-12-04 1995-01-25 Furukawa Electric Co Ltd Voltage setting apparatus in multiplex transmission system
FR2769780A1 (fr) * 1997-10-10 1999-04-16 Peugeot Systeme de transmission d'informations entre stations raccordees par un reseau multiplexe, notamment pour vehicule automobile
EP0918418A1 (de) * 1997-10-10 1999-05-26 Automobiles Peugeot System zur Informationsübertragung zwischen durch ein Multiplexnetzwerk, angeschlossenen Stationen insbesondere für Kraftfahrzeuge

Also Published As

Publication number Publication date
CA1194954A (en) 1985-10-08
DE3376611D1 (en) 1988-06-16
US4888586A (en) 1989-12-19
EP0095389A3 (en) 1985-05-15
JPS58205353A (ja) 1983-11-30
EP0095389B1 (de) 1988-05-11

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